Valve structure



April so, 1940.

J. J. STINES VALVE STRUCTURE Filed March 25, 1937 s sheets-sheet 1' ATTORNEY April 30, 1940.

J. J. sTlNEs 2,198,639

VALVE STRUCTURE Filed March 25, 1957 3 SheeS-Sheei 2 ATTORNEY April 30, 1940. L .1 5T|NE$ 2,198,639

VALVE STRUCTURE Filed March 25, 1937 5 Sheets-Sheet 3 l lNvENToR JOHN J 5TM/E5 BY /u ATTORNEY Patented Apr. 30, 1940 UNITED STATES PATENT OFFICE 14 Claims.

My invention relates to valves, and more particularly to gate valves.

In gate valves, particularly large size valves, such as used on oil and gas pipe lines, much difiiculty is experienced in opening and closing the valves due to the fact that the closure members, or gates, are operated in such a manner by the actuating means therefor, that when moving toward and away from the valve seats, these closure members are also moved transversely of the valve seats, causing an extremely great amount of friction, which often makes it impossible to move the valve either into or out of closing position, and which causes an undue amount of Wear on l5 the valve closure member and on the valve seat. This diii'iculty exists because, in substantially all valves of this character, the valve stem is rotated to move the valve closure members into and out of position opposite the valve seats and continues to be rotated in the same manner to move the closure members into engagement with the valve seats, means being depended upon, within the valve casing, to change the direction of movement of the closure members, from one in the direction of the length of the valve stem, to one transversely of the valve stem, yand vice versa.

It is one of the principal purposes of my invention to separate the two operations; that of moving the gate members, or valve closure meinbers, into or out of position opposite the valve seats, and that of moving said valve closure members, or gate members, toward and away from the valve seats; so that, as said elosure members move in a direction transverse to the valve seats, the same are entirely out of engagement with said valve seats, and when said closure members, or gate members, are moved into seating position, or out of seating position, with relation to said valve seats, this movement lo is a straight line movement toward and away from said valve seats, and not in any other direction whatsoever.

This prevents wear on the valve seats and the valve closure members, and also makes the operation of the valve absolutely certain and makes the valve easier to operate, as it is positive in operation both in its movement into and out of alignment with the seat members, and toward and away from the seat members. Furtheran apparatus of the above mentioned character in which a rotatable operating member is utilized to obtain both the longitudinal movement of the valve stem to move the valve closure members, or gate members, into and out of position more, it is a purpose of my invention to provide l opposite the valve seats and to obtain rotary movement of the valve stem without any longitudinal movement thereof, to move said valve closure members, or gate members, into engagement with the seats and out of engagement with the seats.

More particularly my invention comprises a valve casing, from which a valve stem projects, which is cooperatively related to a hand wheel, so that the hand Wheel will advance the valve lo stem lengthwise of itself in either direction, dependent upon the rotation of the hand wheel, or will rotate said valve stem when this is desired, said valve stem being provided with means for actuating wedges upon the rotation thereof to u move the valve closure members into closing position, and with means for moving said valve closure members out of closing position upon rotation of said valve stein.

It is another purpose of my invention to provide an apparatus of the above mentioned character, in which the means for operating the valve comprises a member that is movable from one position to another position in order to move the valve stem lengthwise of itself without rotating the same, or for rotating said valve stem without moving the same lengthwise of itself. Furthermore, my improved means comprises a member that is movable to such alternative positions, so inter-related with the Valve stem and the rotatable member for operating the valve stem, that there is only one position in which the relationship of this member and 'said valve stem can be changed in order to rotate said valve stem with said rotatable member, this being at the time when the closure members of the valve mechanism are in proper position opposite the valve seats.

It is a further purpose of my invention to provide a valve of the above mentioned character that can be locked in any desired set position thereof, and furthermore to provide such a valve mechanism that can be operated either directly by a screw-threaded connection, or through a Worm drive, to move the valve closure members into and out of engagement with the valve seat.

It is a further purpose of my invention to provide a valve of the above mentioned character, in ywhich pressure on one side of the valve, without a corresponding pressure on the other side thereof, will not in any way affect the operation of the valve or interfere therewith, the valve being as readily operable with a high unbalanced pressure on one side thereof, as with no pressure, or equal pressure, on opposite sides thereof.

Other objects and advantages of my invention will appear as the description of the drawings proceeds. I desire to have it understood, however, that I do not intend to limit myself to the particular details shown or described, but that I intend to include as part of my invention all such modifications and changes as would appear to a person skilled in the art andas would fall within the scopev of the claims,

In the drawings:

Fig. 1 is a vertical sectional view through one form of my improved gate valve.

Fig. 2 is a section taken on the line 2 2 of Fig. 1.

Fig. 3 is a fragmentary section taken on the line 3 3 of Fig. 1, the valve casing. being omitted. y

Fig. 4 is a fragmentary section taken substantially on the line 4 4 of Fig. 2.

Fig. 5 is a section taken on the line 5 5 of Fig. 1.

Fig. 6 is a fragmentary view partly in elevation and partly in section, taken on the line 5 6 of Fig. 1.

Fig. 7 is a yfragmentary top plan view of the rotatable operating member.

Fig. 8 is a fragmentary sectional view taken on the line 8 8 of Fig'. 1.

Fig. 9 is a fragmentary vertical sectional View of a modied form of valve.

Fig; 10 is a section taken on the line I0 |0 of Fig. 9, the valve casing being omitted.

Fig. l1 is a section taken on the line Il ll of Fig. 9, and

Fig, 12 is a section taken on the line l2 |2 of Fig. ll, the valve casing being omitted.

Referring in detail to the drawings, in Figs. 1

4Q to 8, inclusive, is shown one form of my invention, the valve being shown therein as comprising a valve casing having a body portion 20, which is provided with fluid passages 2| leading to a central chamber in said body portion'by means of which said passages 2| are connected when the valve is in open position. Said valve is provided with a chamber 22 extending substantially at right angles to the p-assages 2i, said chamber 22 being formed partly in the body portion 23 and partly in an upper detachable cap portion 2 3 provided on said body portion 23, said cap portion 23 being detachably secured to the body portion 23 by means of securing devices extending through the anges 24 and 25 provided on the cap portion 2 3 and body portion 2,0, respectively, an annular rib 26 being provided on the flange 24 seating in an annular groove 2l on the flange 25 for sealing the joint between the cap portion 23 and the body portion 2G. Thus the valve comprises a chamber 22 and passages 2l leading into, a central space, through which communication is had between said chamber 22 and the passages 2l, and one passage 2l with the other passage 2|. f 'I y Thel ycap portion 2 3 is provided wtih a boss 28, which is provided vwith a central passage, ror bore', 2S therein that opens into a packing recess 30 and a packing gland 3| is Yprovided for compressing the packing material 32 around the valve stem 33 extending through the bore, or passage, 29 so as to provide a fluid tight joint between said valve stem and the valve casing, the packing gland 3l being secured in packing compressing Extending upwardly from the boss 2B are spaced standards 35 forming a bifurcated upwardly extending portion on said valve cap portion 23 that terminates in a socket 36, said socket having an opening 31 therein, through which the screw-threaded portion 38 of the valve stem 33 freely passes, the same being true also of the passage 33 in the packing gland 3l.

An internally screw-threaded portion i3 is pro'- vided on the Wall of the socket member 36 and a sleeve 4l is provided with a flange 42 that fits rotatably within the socket portion 35, said sleeve being provided with an externally screw-threaded portion 43 that screw-threadedly engages the internally screw-threaded portion 44 on the rotatable operating member 45 in the form of a hand wheel having an annular rim portion 45. An externally screw-threaded sleeve 41 engages the internal screw-threads 4l) on the socket member 36, and bearing balls 48 are mounted between said sleeve 41 andthe flange 42, suitable washers 49 of friction reducing metal being provided between said balls 48 and the sleeve 41 and flange t2, respectively.

It will be noted that by the connection described above, the hand wheel, or rotatable operating member, 45 is rotatable relative to the valve cas? ing, but not endwise movable relative thereto. Also it will be noted that due to the ball bearing mounting of said rotatable valve operating mem-y ber 45, the same will turn easily relative to the valve casing and that the valve stem 33 will turn relatively much less readily relative to the valve casing, because of the friction created by the packing 32 against the valve stern, due to com. pression by means of the packing gland 3l. In order to prevent any possible rotation, or unscrewing, of the hand wheel, or rotatable operating member, 45 from the sleeve 4l, a pair of set screws 50 is provided that engage in suitable open+ ings in the hub portion of the hand wheel 46 and the sleeve 4l.

Mounted in an'undercut guideway 5l in the hub portion of the rotatable operating member 45 is a slide 52, the same having inclined side walls to provide a dove-tailed connection with the dove'- tailed groove, or guideway, 5i provided in the hub portion of said rotatable member 45.

The slide 52 is provided with an opening there? in that has .a curved wall portion 53 that is of a slightly larger diameter than the outer diameter of the screw-threaded portion 38 of the stem 33, straight wall portions 54 that are spaced a distance apart equal to the diameter of the curved portion 53, straight wall portions 55 inwardly cifset relative to the portions 5.4 to provide shoulders 56, and a straight end wall 5l perpendicular to they walls 55, The distance from the meeting point of the wall portion 55 and the shoulder 56 from Athe center of the arc of the curved por# tion'53 is at least as great as the radius of said arc, so that said screw-threaded portion 38 of the valve stem can freely pass through the partially circular enlarged portion of the opening in said slide 52. However, said screw-threaded portion cannot pass through the smaller, substantially rectangular portion of said opening having the side wall 55 and the end wall 5l, The valve stem is provided with a squared end portion 58, which is reduced in size and is of very slightly less transverse dimension than the distance between the side walls 55 of the reduced portion of the opening in the slide 52. Thus, this reduced portion of saidr opening can be slidably engaged with the reduced portion 58 on the valve stem 5 vwhen said portion of the valve stem and said slide are in alignment. Such engagement of the parts is shown in Figs. 1 and 7. However, if the slide 52 is moved so as to align the enlarged portion of the opening in the slide with the valve stem, the valve stem can readily pass through said enlarged portion of the opening.

When the parts are in the position shown in Fig. 1 rotation of the rotatable operating member, or hand wheel, 45 will rotate the valve stem therewith in whatever direction said rotatable operating member is turned. If the slide 52 is moved to its alternative position, however, the valve stem and the rotatable operating member 45 will no longer rotate together, but instead, upon rotation of the member 45 in the proper direction, the internal screw-threads 59 on the sleeve 4l engaging with the external threads 38 on the stem 33 will cause said valve stem to be moved longitudinally out of the casing and through the opening in the slidev52 so as to project from the rotatable operating member 45, this continuing as rotation of the operating member, or hand wheel, 45 is continued, until the annular projection 60 on the valve stem 33 engages in the correspondingly formed recess 6l in the cap' member 23. It will be noted that durbelow.

It will also be noted that when the parts are in the position shown in Figs. 1 and 7, the valve stern will be' rotated, but will not be moved longitudinally of itself because the inner end 52 of the valve stem 33 is in engagement with the projection 63 on the inner surface of the valve casing body 20 and the shoulder formed between the reduced end portion 58 and the threaded portion 38 is in engagement with the bottom face of the slide 52, which, in turn, is dove-tailed in the hand wheel 45, said hand Wheel being held against endwise movement relative to the casing by means of the flange 42 thereon. It will also be noted that it is only in the position of the parts shown in Fig. 1, that the slide can be moved to engage the reduced portion of the opening in said slide with the reduced end portion 58r of the valve stem. This is of considerable importance, as it assures the proper location of the valve closure members relative to the valve seats at the time that the valve is to be closed. It is also assurance that there will be no transverse movement of the closure member relative to the valve seatwhen engagement of the valve seat by said closure members takes place.

Said hand wheel, or rotatable operating member, is further provided with a series of recesses 54 in the hub portion thereof, with any of which a pivoted locking finger 65 is adapted to engage, said locking linger being pivotally mounted between a pair of ears 66 provided on the socket portion 36, and being provided with an opening 31 therein, through which a padlock can be passed to prevent movement of the lock out of locking position. It will be obvious that the locking finger can be utilized to lock the valve operating member, and thus the valve, in substantially any adjusted position thereof.

The portion of the valve stem 33 that lies within the valve casing is provided with theI previously mentioned enlargement 60 and an annular enlargement 68 spaced from the enlargement 60 to provide an annular groove 69 between said enlargements. Beyond the` enlargements the stem portion 33 is provided with an externally threaded portion 10, which is threaded to correspond with the threads on the portion 38, and ay reduced threaded portion 1| that is threaded in the opposite direction to the threads on the portion 38.

Screw-threadedly engaging the portion 10 is a wedging member 12 that is internally threaded with a thread corresponding to the thread on the portion 10, and mounted on the screwthreaded portion 1l is a wedging member 13 that is internally threaded to receive said screwthreaded portion 1|, and in a corresponding manner to said screw-threaded portion 1l. It will thus be seen that if the valve stem 33 is rotated in a given direction and the members 12 and 13 are held against rotation, said members 12 and 13 will move in opposite directions lengthwise of the valvestem 33. It will also be noted that, when the wedging members 12 and 13 are in the position shown in Fig. 1, the face 14 of the wedging member 13 will engage the projection 63 and the face 15 of the wedging member 12 will engage the annular enlargement 68 on the valve stem, thus limiting the movement of said' members 1 2 and 13 away from each other. When the operating member 45 is rotated with the reduced portion of the opening in the slide, in engagement with the reduced end 58 of the valve stem in a counter-clockwise direction, looking down on the top of said operating member 45,

said members 'l2 and 13 being held againstrotation, these will be moved toward each other, While if the rotation of the operating member, or hand wheel, 45 is in a clockwise direction, the members 12 and 13 will be moved away from each other until their limiting position, shown Fig. 1, is reached.

The Wedging members 12 and 13 are provided with flat inclined wedging faces 16 and 11, respectively, which engage with similarly inclined wedging faces 18 and 19 on the gate members# or valve closure members, 80. Said gate members, or valve closure members, 88 are provided With flanges 8| that are received in the annularv groove 68 so that the shaft 33 is freely rotatable on said anges 8l, but upon longitudinal move;`

ment, of the shaft 33, said members'll will be moved longitudinally with said shaft 33.

Each of the wedging members 12 and 13 has a pair of radially extending arms-82 thereon, and each larm 82 is provided with a pair of anges Sii-extending in opposite directionsfrom the arms 82 perpendicularly thereto, and with tapering lateral ribs, or projections 84 that extend substantially in alignment with the arms 82 and are slidably receivedv in grooves 85 provided between' anges 4B3 and are receivedin screw-threaded'` 'openingsJ 88,1infthe-1body: portions ofrtherwedging membersv 112isand 13.

`The 'closure; or gate, membersl 8|] are provided with rearwardlycextending; angesf 89 that are received between 'theflanges 83 and the body portions'of, the wedgingmembers 12'ar1dv 13,v said flanges having openings .190 therein, through .wardLfacesSI of: said. gate, or closure members,

'which said:` bolt-like members` 81 extend. YSaid openings Sqare inthe form of` inclined slots `that arearranged all at the 4same angle to the for- '."805 the slots-.of .opposed-gate members approach- .ing .each otherttowardthe mid-portion of said 84. i It `willalso be noted that'when said wedging membersI 12 and. 13 are moved toward each GAI);

'other by rotation of' .the 'shaft 33, .the inclined 'faces thereof, engaging with the corresponding inclinedlfaces of the gate members 80, will move the gate-members'` 80 outwardly away from each vother toward the valve seats 92, said valve seats being annular, or ring-like members, that are provided-with screw-threads 93, that engage the screw-threaded portions 94:.on the valve body 20, and with flat valve seat portions 95.

The valve closure members, or gate members, 80 areprovided with annular grooves 96, in which are seated the-inwardly directed annular flanges 91 provided on the sealing member 98 that have fiat faces that are adapted to closely engage the at sealing faces `95-on the valve seat members 92, and it will be obvious that as the wedging members 12 and 13 move the members 80 outwardly away from each other,lthis movement will continue until the sealing members on the gate, or closure, members80, ,snugly engage the valve seats provided on the casing. To open the valves a reverse movement of the rotatable member 45 is used, and the wedging members 12 and 13 will move away from each other,imoving along the inclined faces 18 and 19` of the ygate members 80. However, this will not positively withdraw the sealing rings on the gate, or closure, members 80 from the valve seats without the provision of the members 81 operating in the slots 90. As the bolt-like members'v 81 move toward the remote ends of the slots 90 as said wedging members 12 andr 13 move away Afrom each other, said boltlike members81 being spaced a fixed distance apart, this will draw the gate, or closure, members 80 toward each other and out of engagement with the valve seats.

As the valves forming the subject matter of this invention, are usually of very large size, and consequently very heavy, means must be provided for handling thesame, and the body portion of the valve is provided with a pair of ns 89 having openings |00 therein, with which hoisting means may be engaged to raise and lower the valve into position. Fins IOI are also provided on the cap portion 23 to strengthen the same. It is, of course, obvious that after the gate members of the valve have been moved to the position shown in Fig. l, the slide 52 is moved to its alternative position from that shown in Figs. 1 and '1 and the hand wheel 45 is rotated to move the valve stem 38 lengthwise of itself, moving the valve mechanism upwardly into the chamber 22 --so as to provide a passage through the valve from YVisxmade in 'fthesame .manner as` previously deif 5; 'one gopening-i 2 I: .to the? other l opening. 2 I that-fis wclear of all obstruction.

' In the form of` the inventioni shownin Figs.- 9 t and v12, inclusive, the body-portion-20' of the valve ber 22', similar'tothe chamber 22 previously described.v 'The valve-stem 33' is constructed in the same manner as the valve stem 33 Where itpassesolO through the member 23, and is provided with the tion to the thread |05, and the threads |05 meshing with corresponding external 'threads |01 on the boss I08'formed on the valve closure member,

or gate member', |09I and the threads |06 meshing25 with threads |I0, corresponding to the threads |03 on a boss III provided on the valve closure member, or gate, |I2. The members |08 and |I2 are exactly the same 1in construction except for the fact that the threads on the boss on the oneT-r-O member extend in a reverse direction from those on ,theboss on'the lother gate member.

-A guide member II3'is provided' rthat has the projections VI I5 thereon that engage in'the groove IIS provided in the one side 'of the body portion-e235 20 and in thev groove I I1 provided between a pair of ribs I I8 on the other side of the body portion #20.1The guide member I I3 has a polygonal outer surface at the opposite ends thereof yprovidingY a pluralityA of flat faces II9 thereon. members, or closure members, ||2 and '|09 have polygonal socket portions having corresponding at faces |20 thereon, said socket portionsbeing formed by means of the annular ribs, or flanges,

Thev gaten-"40 |2I. provided on said members :|09 and' IIZ thatpi embrace the polygonal endr portions of the member I 3. Thus the gate members, or closure members, `|09 and 'I I2 are held froml rotation relative to the guide member |I3 and the guide member |I3 is guided in its longitudinal movements'intoab() randzout of the passagev 22` by means'of the ribs,

or projections,` |I5 thereon. One side off the member- |I3 is enlarged, as indicated-at I22-to provide a space therein for reception of theworm |021 and to provide a mounting for thrust bear-.555

ings `|23 for said shaft, said thrust bearings comprising body portions that are soreW-threadedly engaged with the screw-threaded portion |24 of ithe enlargement |22, and held in xed Yposition bymeans yof the setscrews |25. bearings further comprise the rings, or washers, .|28 of anti-friction"metal,.andl similar rings, or washers, |21, between which the bearing balls ,|38 are mounted..

The member I|3 yis further provided Withanff-fi ,annular flange |28 that engages theshoulder |29 provided between the main bodyportion of the member |04 and the reduced end portion|30 thereof, thus holding said member |04 from endwise movement relative to the member ||3 irrlx one direction. A ring |3| Vis provided that hasv external screw-threads thereon that engage with the internally screw-threaded portion |32 on the member I| I 3 at 'the opposite end thereof, said ring I3| engaging a shou1der-`-|29 provided betweensxq the reduced end portion |30 on the corresponding end of the member |04 and the main body` portion of said member |04. Thus the ring member |3| and the flange |28 conne the member |04 from endwise movement relative to the member I3, but permit free rotation of` said sleeve |04 within the guide member ||3. i Set screws |33 are provided to lock the ring-like member |3I in position so as to prevent any accidental unscrewing thereof fromthe member I3.

It will be obvious that upon rotation of the shaft 33' in one direction the sleeve |04 will be rotated in one direction, andupon rotation of the shaft 33 in the opposite direction, the sleeve |04 will be rotated in the opposite direction.4 It will also be obvious that as the member I 04 is rotated in one direction the members |09 and I2 will be moved away from each other, in view of the fact that the same are held from rotation with the sleeve |04, dueto the polygonal engaging portions on the members |09 and ||2 and the member |'|3, and that upon rotation of the sleeve-like member in the opposite direction the members |09 and H2 will be moved toward each other.

Each of the members |09 and ||2 is provided with an annular conical sealing face |34, which engages with a correspondingly shaped valve seat |35 on the valve seat ring 92', which is similar to the member 92, previously described, and secured in position in a similar manner in the body of the valve. It is, of course, to be understood that the shaft 33 does not extend centrally of the opening 22', but at one side thereof, and that the upper mounting for the valve stem and its rotatable operating means will be correspondingly offset to one side of the valve structure. ever, the construction and operation thereof is the same as previously described. The valve will operate in a similar manner to that vpreviously described. The rotation of the hand wheel, or rotatable operating member, 45, while the slide has the squared part of the .opening in engagement 'with the reduced end vportion 58 of the valve stem, will rotate the valve stem 33', and thus move the valve closure members |09 and ||2 either toward or away from each other, and either into engagement with, or away from the valve seats, while upon movement of the slide member to its alternative position, rotation of the hand wheel, or rotatabley operating member, 45 will cause longitudinal movement of the `valve stem 33 and move the valve mechanism bodily, either into close relation to the valve seats, such as the position shown in Fig. 9, or out of such position, so as to provide a free passage from the passage 2| on one side of the valve to the passage 2| on the other side of the valve.

In the case of the valve mechanism shown in Figs. 9 to 12, inclusive, the operation oftheworm and worm wheel as a self-locking operating means, will prevent rotation of the sleeve |04 and of the valve stern 33 when there is no positiver drive, such as obtained by the engagement of the squared portion of the opening in the slide 52 with the squared end of the stem` 58, aided, of course, by the Afriction created by `the packing material previously mentioned. Similarly, in the valve mechanism shown in Figs. 1 to 8, inclusive, the wedging members that are in engagement with the wedging faces on the gate members 80 Y will offer such resistance to their movement, due

How-

only thereof is desired, and will only operate upon positive rotation of the valve stern by engagement of the squared portion of the slidey 52 with the squared portion 58 on the end ofthe valve stem said casing, a stem projecting from said casing.

rotatable means, means for connecting said rotatable means with said stem to either move said stem longitudinally without rotating said stem or rotate said stem without moving said stem longitudinally, and a controlling member for said connecting Ymeans slidably mounted on said rotatable means and having a position in which said stem rotates with said rotatable means and a position in which said rotatable means rotates relative to said stem, said controlling member being movable from one position to the other positionthereof only vin one position of said valve stem. f

` 2. In a valve, a casing, valve mechanism. within said casing, a stem projecting from said casing, beveled valve seats in said casing, said valve mechanism comprising closure members having beveled faces, said closure members being movable toward and away from said seats, and longitudinally with i said stem, rotatable operating means engaging said stem, said stem being provided with `means for moving said stem longitudinally upon rotation of said operatingk means and with means for rotating said stem upon rotation of said operating means, said valve mechanism 4comprising means for moving said closure members toward or away from said seats by 4rotation of said stem, said closure members being movable into and out of position opposite said seats by movement in the direction of length of said stem, and a controlling member adjustable upon said closure members reaching a position opposite said seats to hold said closure members from movement in the direc-tion of length of said stem during movement thereof toward or away from said seats.

3. In a valve, a casing, valve mechanism within said casing, a stem projecting from said casing, beveled valve seats in said casing, said valve mechanism comprising closure members having beveled faces, said closure members being movable toward and away from said seats, and longitudinally with said stem, means for moving said closure members toward or away from said seats by rotation -of said stem, said closure members being movable linto and out of position opposite said seats by movement in the direction of length of said stem, and a controlling member engageable with said stem only when said closure members are opposite said valve seats to hold said closure members fromA movement in the direction of length of said stem during movement thereof toward or away from said seats.

4. In a valve, a casing, valve mechanism within said casing, a stem projecting from said casing, valve seats in said casing, said valve mechanism comprising closure members movabletoward and away from said seats, and longitudinally with said stem, means for moving said closure members toward or away from said seats by rotation of said stem, said closure members being movable into and out of position opposite said seats by movement in the direction of length of said stem, and means controlling the movement ofsaid stem responsive to said operating means, comprising aslide on said operating means having a portion Within which said. stem rotates and a portion ,interlockingiwith a portionlofv said stem,said"slide being movable transversely ofV said stem froml one alternative position tothe otherralternative -position thereofonlyl in one positionlroisaid stemy whereby said closure members can be moved toward said seats only after saidclosure members are in position opposite saidseatsand in: transverse alignment therewith.

5. In a valve, a casing, valve mechanism within, saidY casing, a steml projecting from said casing,A

said stem having a threaded portion, a rotatable operating member having threaded means there on engaging said threaded portion of saidstem to move said stem axiallythrough said operating member upon rotation of said operating member and inter-engageable means on said stem and said operatingmember to rotate saidv stem and operating member in-unison, said inter-engageable means comprising a .member slidablyvmounted' on said operating member and movable into4 inter-engagement with said stem in only one position of saidy stemrelative to said operating member.

6. In a valve, a-casing,v valvermechanism within said casing, a Astem projecting from said casing,

said .stem having a threaded portion, a rotatable operating member'having .threaded means thereon engaging said threaded portion of .saidvstem to move said stem axially upon rotation of said 1 operating member, a reduced polygonal end portion on said valve stem, and atransversely mov able member on said operating member havingY an' opening therein throughrwhich said valve stem is adapted to pass and lhaving means thereon engageable only with the polygonal portion lof said valve stem to rotatesaid stem and` operating member in unison, said operating member engaging a shoulder on said sternv to hold said -stemfrom endwise movement when said means islin,

engagement with said polygonal portion.

'7, In avalve, a casing, valve mechanism within said casing, a stem projecting. from said casing, rotatable means externallyr of said casingl for either rotating said stem or. moving the-same lengthwise of itself, said valve'm'echanism comprising a .pair of gate members on said stem, said stem having a pair of spacediannular shoulders-1 thereon to define a groove, means on vsaid gate. members seated in said groove, a pair. of ,wedgingl members on saidstem engaging, said gate-mem'- bers, said gate membersfand wedging members being mounted to .move in unisonwith-said stem upon movementof said stern-lengthwise of .itself without changing the relative positions of said gate members and wedging members, valve. seats in said casing, said' gate members having inclined slots therein, means on said wedging' members extending through said slots, and'y threaded means positively moving said wedgingl members toward each other uponrotation of said-stem in one direction to move said gate members toward said seats, and positively movingk saidl wedging members away from each other upon rotationv of said stem in the opposite direction to cause Ysaid means extending throughsaid slots yto move said gate members away fromsaid seats, comprising threaded stem portions of different diameters, the smallest thereof being adjacent the end` of said stem within said casing.

8. In a valve, a casing,va1ve mechanism within said casing, a stemv projecting from said casing, rotatable means externally of said casing for either rotating said stem or moving the same lengthwise of itself, said valve mechanism comprising a pair of gate' members on` said stem,

valv'eiseats in` said" casing;L and: meansA onr` said' stem' for `moving saidgatemembersitoward and awayzfrom said vseatsgsaid'gatemembers andl said meansi-forsmovings the same being movable as a` unit"r witlrzsaid stema lengthwise thereof, said.

9. VIn a valve; acasing,;valvemechanismgwithin' said: casing,` a stem iprojectingrfrom said casing,

rotatablermeans. externally. of said casing g for either: rotating.. said.;stem-- or moving. the sameV lengthwise:` of itself; said.' valvel mechanismvcomprising a pair of gate members o n said stem hav.- ing beveled ifaces, ,valve seats .in Ysaid v'casinghaving beveled faces, andY means1on'said-fstem for'- moving-'said gatelmembers toward Land away from said seats, said gate members-.andsaidmeanszfor moving the same beingzmovableifas a-y unitxwith: said stem lengthwise thereof, saidi meansr for moving said gate membersetoward andawayffrom saidv seats, being positivelygdriven topositively.

move `said'lgate members towardsad seats-without any movement f of said gate:A members in the direction of `the vlength of said stemrupon-rotation of `said stemin one:directionand:1 to positively;-k

:ma y

move said gate members; away from-saidwseatsry without any movementf of said gate members in the direction: of the.- length of? saidstemupon` rotationof said stem infther opposite direction-, and connecting meansl ongsaid=rotatable meansv and said stemadjustable to connect these-me ltori rotate said stemonly" after said gatefmembers are aligned with'said seats.

10. In a valve, a casing, ValVemechanism-.with in said casing, a stemaprojectingffrom saidpcas'f ing, rotatable Ymeans externally. of asaid casingfor` either rotating, saidstemcr moving, the same' lengthwise of itself, saidvalve. mechanismfcom-- prising a pair of gate'members onsaid stem, al rotatable member having a1rightvscreW-threaded connectionwith one of.. said'y gate. members; and

a left-screW-threaded connection with thefother: of saidf gate members, means ,on saidLstem holdf ing said gate membersfrom,rotation:,with1saidV rotatable member andiaworm drive connectionv between said` rotatable memberandi said; valve` stem.

1l. In a valve; .acasing, valve mechanism within said'casing, avv stem projecting lfrom said casing,x rotatable means.r externally ofvk said casingpfor,U

either rotating said stem-v or. moving the' same lengthwise of itself, saidvalvennechanism com:-

prising a pair of gate'memb'erson saidV Stemra. rotatable member having a right screwthreadeda connection with: one of` saidgat'eimembers andaas left screw-threaded connection. withl the other.V

of said gatefmembers,v a. guiding-.memberfor saidl gate members engaging, said:` gater members to hold the same against rotatlonzwith said'rotatablef membenand a: worm drive. connection` betweenv said rotatable member-'andisaidi valve: stem, come prising. a. Worm 1 on saidgstem' andaworm wheel portion non 'said'l rotatable member.

12. In a valve, a casing, valve mechanism within said casing, a stem projecting from said casing, rotatable means externally of said casing for either rotating said stem or moving the same lengthwise oi itself, said valve mechanism comprising a carrier member mounted for guided movement in the direction of length of said stem in said casing, said stern being rotatably mounted in said carrier member, a pair of gate members slidably non-rotatably mounted on said carrier member, a sleeve rotatably mounted in said carrier member having a right screw-threaded connection with one of said gate members and a left screw-threaded connection with the other of said gate members and a Worm drive connection between said rotatable sleeve and said valve stem.

13. In a valve, a casing, valve mechanism within said casing, a stem projecting from said casing and rotatable means externally of said casing for either rotating said stem or moving the same lengthwise of itself, said valve mechanism comprising a carrier member mounted on said stem, means on said carrier member and said casing for guiding said carrier member for movement in the direction of length of said stem, means in said carrier member for mounting said stem rotatably therein and holding saidcarrier member against axial movement relative to said stem, said carrier member having attened portions thereon, a pair of gate members slidably mounted on said carrier member and having socket portions having flattened portions cooperating With the flattened portions on said carrier member to hold said gate members from rotation on said carrier member, said carrier member having a bore therethrough, a sleeve threaded projections on said gate members cooperating with the threaded portions of said sleeves and a selflocking driving connection between said stem and said sleeve to rotate said sleeve upon rotation of said stem.

14. In a valve, a casing, valve mechanism within said casing, a stem projecting from said casing and rotatable means externally of said casing for either rotating said stem or movingv the same lengthwise of itself, said valve mechanism comprising a carrier member mounted on said stern, means on said carrier 'member and said casing for guiding said carrier member for movement in the direction of length of said stem, means in said carrier member for mounting said stem rotatably therein and holding said carrier member against axial movement relative to said stem, said carrier member having polygonal projecting formations thereon, a pair of gate members slidably mounted on said carrier member and having polygonal socket portions receiving said polygonal formations on said carrier member to hold said gate membersI from rotation on said carrier member, said carrier member having a bore therethrough, a sleeve journalled in said bore, said sleeve having `oppositely internally threaded portions, oppositely threaded projections cn said gate members cooperating with the threaded portions of said sleeves and a selflocking driving connection between said stem and said sleeve to rotate said sleeve upon rotation of said stem.

JOHN J. STINES. 

